Abstract:
Sorption phenomenon plays relevant role
in the estimation of the solubility, availability, mobility
and tendency of ion pollution of the environment.
A field experiment was laid out in RBD with three
replications and seven treatments using soluble and
insoluble sources of phosphorus at different combination
and lime during 2014 and 2015 to study their
effect on the silfur sorption behavior under groundnut
cropping system in Alfisols. Sulfate sorptivity was
studied with shaking three grams soil for 24 h with 15
ml solution of K2SO4 varying in SO4
–concentration
from (0, 25, 50, 75, 100, 125 and 150 μg S g-1 of soil) in
a 50 ml centrifuge tubes at 25oC for 2 h. Sorption data
were fitted in linear, Langmuir and Freundlich equations
and sorption parameters especially sorption
maximum (b or Smax), affinity constant (k), maximum
buffering capacity (MBC), distribution coefficient (kf),
sorption intensity (n), S (kd) and Gibbs free energy
(DG0) were calculated. In general, sulfate sorption
process was favorable, spontaneous, exothermic and
controlled by dissociative mechanism.
